Pachyonychia Congenita - Symptoms, Causes & Treatment
Medically reviewed by Dr. Anand S. Urhekar, MD, MD Pathology, Clinical Advisor · Last updated July 2026
A rare inherited disorder of keratin genes producing markedly thickened nails, painful thickened calluses on the soles, cysts, follicular keratoses and white patches in the mouth. Plantar pain, rather than the nail changes, is usually the most disabling feature.
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Quick Answer
Pachyonychia congenita is a rare inherited keratin disorder marked by thickened, wedge-shaped nails and severely painful calluses on the soles, often with cysts and oral white patches. Plantar pain is the dominant problem and can limit walking. There is no cure; management combines callus paring, cushioned footwear and orthotics, keratolytics, pain control, and specialist input through patient registries and trials.
Symptoms
- Markedly thickened, wedge-shaped nails from early childhood
- Painful focal calluses on weight-bearing soles
- Blisters under calluses
- White plaques on the tongue and inner cheeks
- Cysts, follicular keratoses on elbows and knees, excess sweating of palms and soles
Causes & Risk Factors
- Autosomal dominant mutations in keratin genes KRT6A, KRT6B, KRT16 or KRT17
- Inherited from a parent or arising as a new mutation
- Confirmed by genetic testing
Treatment & Management
- Regular paring and debridement of calluses
- Keratolytics — urea and salicylic acid preparations
- Custom orthotics and cushioned footwear
- Nail trimming, grinding, or surgical nail matrix ablation in selected cases
- Pain management, botulinum toxin for sweating, and enrolment in specialist registries and trials
When to See a Doctor
See a dermatologist and podiatrist for ongoing care. Seek review for signs of infection in cracked calluses, or if foot pain is limiting walking and daily activity.
Frequently Asked Questions
Is the nail thickening a fungal infection?
No, although it is very commonly misdiagnosed as one and treated with antifungals for years. Pachyonychia congenita is genetic, present from early childhood and affects multiple nails symmetrically.
What helps the foot pain most?
A combination of regular callus debridement, well-designed cushioned orthotics and keratolytic creams. Many patients also benefit from specialist pain management and adapted footwear.
Related Conditions
Medical References
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Medical Disclaimer: This information is for educational purposes only and is not intended as medical advice. The content on this page should not be used to diagnose or treat any health problem. Always consult with a qualified healthcare professional for proper medical evaluation, diagnosis, and treatment of your condition.